For many centuries, Aristotle's Physics was the essential starting point for anyone who wished to study the natural sciences. This is the first complete translation since 1930 of Aristotle's key work on science. It presents Aristotle's thought accurately, while at the same time simplifying and expanding the often crabbed and elliptical style of the original, so that it is very much easier to read. A lucid introduction and extensive notes explain the general structure of each section of the book, and shed light on particular problems